Sour Cream Apple Pie

2 eggs
1 cup ( 8 oz.) sour cream
1 cup sugar
6 Tbsp. all-purpose flour, divided
1 tsp. vanilla
1/4 tsp. salt
3 cups chopped, peeled baking apples
1 unbaked pie shell ( 9 in. )
3 Tbsp. butter, softened
1/4 cup packed brown sugar
In a large bowl, beat eggs. Add sour cream. Stir in sugar, 2 Tbsp flour, vanilla and salt; mix well. Stir in apples. Pour into pie shell. Bake at 375 degrees for 15 minutes. Meanwhile, combine butter, brown sugar and remaining flour. Sprinkle over top of pie. Return to oven for 20-25 minutes or until filling is set. Cool completely on a wire rack. Serve or cover and refrigerate.